Ring Size Chart UK

Choosing the right ring size can feel tricky, especially when you’re shopping online or converting between countries. That’s why we’ve made this clear and easy-to-read UK Ring Size Chart to help you find the perfect fit. This UK Ring Size Chart provides a detailed comparison of ring sizes across four major sizing systems: UK, US, EU, and metric measurements (inside diameter and circumference in millimeters).

In the UK, ring sizes are usually marked with letters from A to Z, with A being the smallest. Each letter represents a specific diameter and circumference, making it easier to find an accurate fit. For example, a UK size M has an inside diameter of 16.71 mm and matches a US size 6.5 or EU size 52.5. If you already know your US or European size, you can easily find the UK equivalent using this chart.

Whether you’re buying a gift, ordering a custom ring, or comparing sizes across countries, this UK to EU and US ring size conversion table will help. No more guessing or trying to return ill-fitting rings! Just check your measurement and find the matching UK size — simple, clear, and reliable.

UK Ring Size to European

UK Size	EU Size	Inside Diameter (mm)	Circumference (mm)
A	38	12.04 mm	37.8 mm
B	39	12.45 mm	39.1 mm
C	40	12.85 mm	40.4 mm
D	41.5	13.26 mm	41.7 mm
E	42.5	13.67 mm	43.0 mm
F	44	14.07 mm	44.3 mm
G	45	14.48 mm	45.6 mm
H	46	14.88 mm	46.8 mm
I	47.5	15.29 mm	48.0 mm
J	48.5	15.49 mm	48.7 mm
K	50	15.90 mm	50.0 mm
L	51	16.31 mm	51.2 mm
M	52.5	16.71 mm	52.5 mm
N	54	17.12 mm	53.8 mm
O	55	17.53 mm	55.1 mm
P	56.5	17.93 mm	56.3 mm
Q	58	18.34 mm	57.6 mm
R	59	18.75 mm	58.9 mm
S	60.5	19.15 mm	60.2 mm
T	62	19.56 mm	61.4 mm
U	63	19.96 mm	62.7 mm
V	64.5	20.37 mm	64.0 mm
W	66	20.78 mm	65.3 mm
X	67.5	21.18 mm	66.6 mm
Y	68.5	21.59 mm	67.8 mm
Z	70	21.99 mm	69.1 mm

This chart shows the exact conversion between UK ring sizes and European (EU) ring sizes, helping you find the perfect fit when shopping across regions. UK sizes are labeled with letters, while EU sizes are based on the inner circumference in millimetres. For example, a UK size M is equal to a European size 52.5, which fits a finger with a 52.5 mm circumference. If you already know your ring size in the UK system or have measured the inside of a ring you own, you can use this table to quickly find the matching EU size. It’s a handy guide whether you’re buying from a European jeweller or converting ring sizes for travel, gifts, or international orders.

American Ring Size Conversion to UK

US Size	UK Size	Inside Diameter (mm)	Circumference (mm)
0.5	A	12.04 mm	37.8 mm
1	B	12.45 mm	39.1 mm
1.5	C	12.85 mm	40.4 mm
2	D	13.26 mm	41.7 mm
2.5	E	13.67 mm	43.0 mm
3	F	14.07 mm	44.3 mm
3.5	G	14.48 mm	45.6 mm
4	H	14.88 mm	46.8 mm
4.5	I	15.29 mm	48.0 mm
5	J	15.49 mm	48.7 mm
5.5	K	15.90 mm	50.0 mm
6	L	16.31 mm	51.2 mm
6.5	M	16.71 mm	52.5 mm
7	N	17.12 mm	53.8 mm
7.5	O	17.53 mm	55.1 mm
8	P	17.93 mm	56.3 mm
8.5	Q	18.34 mm	57.6 mm
9	R	18.75 mm	58.9 mm
9.5	S	19.15 mm	60.2 mm
10	T	19.56 mm	61.4 mm
10.5	U	19.96 mm	62.7 mm
11	V	20.37 mm	64.0 mm
11.5	W	20.78 mm	65.3 mm
12	X	21.18 mm	66.6 mm
12.5	Y	21.59 mm	67.8 mm
13	Z	21.99 mm	69.1 mm

This chart shows how American (US) ring sizes convert to UK sizes, making it easy to find the right fit. In the US, ring sizes are numbered (like 6, 7, 8), while in the UK, sizes are represented by letters (like L, M, N). For example, a US size 7 is the same as a UK size N, with an inside diameter of 17.12 mm. If you know your ring size in the American system, you can use this chart to quickly find the UK equivalent before ordering from a UK jeweller or website. It’s also helpful if you’re sending a ring gift overseas or moving between countries. Just match your US size to the UK letter and shop with confidence!